linux-kernel - Re: [PATCH v4 5/9] usb: dwc3: core: make dual-role work with OTG irq

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Message-ID: <20150906022040.GC4914@shlinux2>
Date:	Sun, 6 Sep 2015 10:20:40 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Felipe Balbi <balbi@...com>
CC:	Roger Quadros <rogerq@...com>, <tony@...mide.com>,
	<Joao.Pinto@...opsys.com>, <sergei.shtylyov@...entembedded.com>,
	<jun.li@...escale.com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v4 5/9] usb: dwc3: core: make dual-role work with OTG irq

On Wed, Sep 02, 2015 at 09:43:38AM -0500, Felipe Balbi wrote:
> Hi,
> 
> > +
> > +static irqreturn_t dwc3_otg_irq(int irq, void *_dwc)
> > +{
> > +	struct dwc3 *dwc = _dwc;
> > +	irqreturn_t ret = IRQ_NONE;
> > +	u32 reg;
> > +
> > +	spin_lock(&dwc->lock);
> 
> this seems unnecessary, we're already in hardirq with IRQs disabled.
> What sort of race could we have ? (in fact, this also needs change in
> dwc3/gadget.c).
> 

Is it possible the kernel process is accessing the content you will 
access?

-- 

Best Regards,
Peter Chen
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